Tool retainer



2 Sheets-Sheet l 0 may Feb. 18, 1930. w. G. NAISMITH TOOL RETAINER IFiled Nov. 19. 1926 Feb. 18, 1930. w. G. NAISMITH TOOL RETAINER -File'qlNov. 19. 1926 2 Sheets-Sheet 2 Patented Feb. 18, 1930 1" U ITED STATESPATENT' oFrlcs v 4 WILLIAM Gr. NAISMITII, OF DENVER, COLOR-ADO,ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE GARDNER-DENVER COMPANY, OFQUINCY, ILLINOIS, A CORPORATION OF DELAWARE Application filed. November19, 1926. Serial No. 149,480.

The object of the present invention is to providean effective retainerof a novel character' that will withstand hard usage.

i The preferred embodiment of the inven- 91 tion is illustrated in theaccompanying draw- 'ings, wherein:

Figure 1 is aside elevation of the chuck of a drillingapparatus, showingthe retainer in place thereon, and in its operative posi- 'tion, V

i Figure 2 is a view similar to Figure 1, but showing the retainer swungto its inoperative positio i I Figure 3 is an end elevation,

' 1 5 Figure 4: is a longitudinal sectional view,

Figure 5'is across sectional view on the line 5-5 of Figure 4,

' Figure 6 is a detail view in elevation, showing the position of theretainer when the re r21) s'istance spring is being placed,

. Figure 7 is a view in elevation of the chuck with .the other partsremoved, A

' Figure Sis a sectional view on the line 8-8 of Figure 7,

"Figure 9 is a perspective view of said chuck,

' Figure10 isa perspective view of the tool retaining yoke and thecarrier blocks.

-' A chuck is shown at 11, andis adaptedto be mountedon thefront end ofsuitable drillfa'o in apparatus. A portion of said drilling apparatus isshown in Figure 4 and'includesa barrel 12 and a hammer 13 that operateson a drill steel asv 14,"place d in the chuck 11.

This steel is providedwith a collar-'15. It is believed that the type oftool will be readily understood to those; skilled in the art. The chuck11 is providedjon opposite sides with substantially -U-shaped guideways,each having spaced side walls 16 and17, the side wall 17 beingpreferably longer than the side wall 16, and having a terminalenlargement 18' with a beveled end, constituting an abutment "shoulder19, Slidable in these guideways are carrier members in the form ofblocks 20, having thereon outstanding gudgeons 21; *The front ends ofthese blocks 1 are curved, as'illustrated at 22,,the curvaturepreferably having a radius with an axis coincident to the axislof theudgeons. 1 The I '-i;o .ch1ick is" furthermore provi' edon oppositesides of the guideways with stop lugs 23, and has in its front end aperipheral annular groove 24.

The tool retainer is in the form of a yoke 25, adapted to embrace thedrill steel 14: in advance of the'collar 15, and has its interior areaofless diameter than the diameter of the collar, so that when in place,as shown in Figures 1, 3 and 4, the tool cannot become dislodged'fromthe chuck. This yoke preferably has on opposite sides of its openportion inwardly extending lugs 26 that are adapted to engage over thecollar 15 when the collar is against the yoke, and thus prevent anytendency of the yoke to open. The yokehas rearwardly extending side arms27 provided with openings '28 that receive the gudgeons 21. Consequentlythe yoke is pivotally mounted on the carrier blocks 20. Said side armsfurther have inwardly extending lugs 29that slidably bear against thecurved front shoulders 22 of the carrier blocks, and'when theyoke isswung to open position to release the drill steel, these lugs 29 abutagainst the shoulders 19 of the enlargements 18 of the guideways, andserve to limit the outward swinging movement of the yoke. The yoke,however, can, swing, in an opposite direction, and to a greater degreethan its opening movement, when there is no drill steel in the chuck,aswill beevident by reference to Figure 6.

Surrounding the chuck is a coiled spring 30, the rear end of which bearsagainst the lugs 29. Its front end is abutted against a holding collar31, fitted upon the front end of the chuck. This holding collarhas aninternal groove 32 that overlies and alines with the annular groove 24in the chuck. In these'grooves'iszseated a split holding ring 33 thatthus serves to effectively lock the collar against outward movement.

1 With this construction, when a steel is in splace and the yoke is inoperative position, the steel can have a limited longitudinal move-Inent inthe chuck, which movementis limited by the yoke, but cannotbecome detached therefrom. It will be noted in connection with'this,that the spring bears against the lugs 29 and the lugs 29, in turn, bearagainst the gudgeon blocks As a consequence many of the shocks and jars,especially on the rearward movement of the yoke,

are transmitted directly to the blocks 20, and

by them against the rear ends of the guideways, thus relieving thegudgeons ofthe same.

When the yoke is swung-to open position, the spring then bears againstthe beveled ends of the lugs 29, and holds the yoke in suchpositionagainst the stop shoulders. 19. When there is no drill steel in thechuck, the yoke can be swung to an opposite inclination, as indicated inFigure 6, in which case the spring 30 will bear against the stoplugsf23. This is a desirable relation of parts when assembling theretainer In other words, the blocks 20 are first engagedwith the yokeand put in the guideways, after which the spring 30 is placed inposition, the yoke being in the position shown in Figure 6. The holdingcollar 31 is then slipped over the endof the chuck and passed beyond thegroove 24 of -said chuck. By allowing the spring torslip downwardlyagainst the lugs 23, it does not have to be so greatly compressed. Thesplit retaining ring 33 is then "snapped into the groove'24, and theholding collar allowed to slide forwardly until :it covers the spring,as shownin Figure 4, whereupon the device is assembled and the yokecanthen be swung to the opposite position in order to permit a steel beingplaced in the chuck.

From the foregoing, it is thought that the construction, operation andmany advantages of the herein described invention, will be apparent tothose skilled in the art,:without furing the toolholder and acting onboth car'- riers, and a tool retaining-yoke having pivotal connectionswith'both members.

2. The combination with drilling apparatus having a tool; holding chuck,saidchuck being provided with longitudinal guideways on its oppositesides, of gudgeon carriers slidably mounted in the guideways, ayokehaving side armsjournaled on the gudgeon carriers,'and a coiledspring surrounding the:

chuck in advance of-the carriers and operat ing against the same. I 3.The combination with tus having a tool holding chuck, saidchuck beingprovided with longitudinal guideways on its opposite sides, of gudgeoncarriers slidably mounted in the guideways, a yoke havdrilling apparaingside arms j ournaled on the gudgeons carriers, and a coiled springsurrounding the chuck in advance of the carriers and abutting againstthe same, said chuck having an annular groove in its front end, a collarsurrounding the chuck, overlying the" groove and having an internalgroove, and a retaining ring in said grooves, said collar constitutingan abutment for the spring. v

4 The combination with drilling apparatus having a holderfor a tool tobe operated on, of aguideway on the apparatus, a carrier member slidablymounted in the guideway,

and a'tool retaining yoke having a pivotal mounting on the carriermember and having an abutment against the carrler member in addition tosaid pivotal mounting, to relieve the latter from shocks imparted to theyoke; 5. The combination with drilling apparatus having a holder for atool to be, operated on, of a guideway on the apparatus, a carriermember slidably mounted in the guideway and having an abutment,shoulder, and a tool retaining yoke having a pivotal mounting on thecarrier member and havinga fixed shoulder slidably engaged with theshoulder of the carrier to relievethe pivot mountingfrom shocks impartedto the yoke.

.6; The combination with drilling appara-' tus having a holder for atool to be operated on, of a giiidewayon the apparatus, a carrier blockslidably mounted in the guidewayand V having a fixed abutment shoulder,and a retaining yoke having an arm pivoted to the block and having aninset lug that slidably bears against the shoulder.v

7. The combination with tus having a holderfor a tool to be operated on,of guideways on opposite sides ofthe 3 same, carrier blocks slidablymounted in the guideways, and a tool retaining yoke having side armsthat are pivotally engaged with the blocks and having sliding bearingsagainst the ends of theblocks.

8.- The combination withldrilling appara tus'having a holderfor a'tooltobe operated on, of guideways on opposite'sides of the drilling apparasame, carrier blocks slidably mounted in the guideways, a toolretainingyoke having side arms that are pivotally engaged with the blocks andhaving sliding bearings against 1 the endsofthe blocks, and'aspringsurround ing the tool holding means and having beare slidably bearagainst the blocks; 7

9. The combination with drilling apparatushaving a chuck forholdingatool to be operated on, of a tool retaining yoke pivotally mounted onthe chuck, a spring that normally' bears against theiyoke 'to resist itsmovement, a removable abutment for the ings againstthe portions of thearms that spring, and a stop for theiportionof the spring that bearsagainst thevyoke, '"said spring when bearing againstthe yoke being o ofngagement, w t th step endaid yoke'being movable to a position to permitthe spring to bear against the stop.

10. The combination with drilling apparatus having a chuck for holding atool to be l operated on, of guideways on Opposite sides of the chuck,each having spaced walls, carrier blocks slidably mounted in theguideways, a tool retaining yoke pivoted to the blocks and havingshoulders that bear against the ends of the Walls when the yoke isswung, and a spring surrounding the chuck and bearing against theshoulders of the yoke.

11. The combination with drilling apparatus having a chuck for holding atool to be operated on, of guideways on opposite sides of the chuck,each having spaced walls, one of said walls being longer than the other,carrier blocks slidably mounted in the guideways, a tool-retaining yokehaving side arms ivoted to the carrier blocks and having shoulders thatbear against the blocks and rier blocks, a spring means on the toolholder for resisting the sliding movement of the blocks in theguideways, and abutments on the side arms that slidably engage thecarrier blocks, are abutted against by the spring means and strike theguideways to limit the swinging movement of the yoke.

In testimony whereof, I aflix my signature.

WILLIAM G. NAISMITH.

the ends of the longer walls when the yoke I is swung in one direction,a spring surrounding the chuck and bearing against the shoulders of theyoke, stop lugs for the spring carried by the chuck and so disposed thatp the spring will bear against them when the yoke is swung over theshorter walls, and a front abutment for said spring, removable andreplaceable when the spring is against said stop lugs. a

12. The combination with drilling appara- 1 tus having a tool holder, ofa carrier slidably mounted on the tool holder, a tool retainer.:pivota1ly mounted on the carrier, a spring mounted on the tool'holderfor resisting the sliding movement of the carrier and retainer, and anabutment for the spring carried by the retainer at one side of its pivotaxis.

13. The combination with drilling apparatus having a toolholder, of acarrier slidably mounted on the tool holder, a tool retainer pivotallymounted on the carrier, a spring fmounted' on the tool'holder forresisting the sliding movementof the carrier and retainer, and anabutment for the spring carried by the retainer at one side of its pivotaxis and having a sliding bearing against the carrier.

14. The combination with drilling apparatus having a tool holder, of acarrier slidably mounted on the tool holder, a tool retainer pivotallymounted on the carrier, a spring mounted on the tool holder forresisting the sliding movement of the carrier and retainer, an abutmentfor the spring carried by the retainer at one side of its pivot axis andhav- Y- ing a sliding bearing against the carrier, and

a stop on the tool holder against which the pivotal movement of theretainer.

1 '15. The combination with drilling appara- 'tus having a tool holder,and guideways on opposite sides thereof, of carrierblocks slidablymounted in the guideways, a tool retaining yoke having side arms pivotedto the carabutment on theretainer strikes to limit the

